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Riparazione della valvola a sfera

Riparazione della valvola a sfera

Riparazione della valvola a sfera

Only ball valves with a dismountable body are subject to repair. Welded ball valves are not repairable and must be replaced in case of failure.

Possible malfunctions and ways to fix them

Malfunction Cause Remedy
Does not seal off flow Damaged or insufficiently tight fitting end seals to the ball 1. Tighten the clamping bolts that press the end seal against the ball.
2. If the end seals are damaged, they should be replaced.
- // - Abrasive wear of the ball (the valve was in a semi-open state, which is not allowed) Replace the ball, and install a mesh filter in front of the valve to catch solid particles that damage the ball.
Leakage along the stem Damaged stem seal 1. Tighten the nut that presses the sealing ring (seal).
2. Replace the sealing ring (seal).
Cannot open/close Ball seized Disassemble the valve, clean the surface of the ball, and replace the end seals if necessary.
To avoid recurrence of the malfunction, it is recommended to periodically open/close the valve during operation.

Attention! Before repairing a ball valve, the area on which it is installed must be drained. Repair work on a ball valve under pressure is not allowed.

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118

DN
Diametro nominale DN
mm
PN
Pressione nominale PN
bar
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